John S. Lew, Arnold L. Rosenberg
Journal of Number Theory
The n-dimensional origin-crossing language, On, is a language each of whose words describes a walk through n-dimensional space beginning and ending at the origin. For each n, On is real-time recognizable by an n-counter machine but not by any (n - 1)-counter machine. In contrast, for all n, On is real-time recognizable by a one-tape Turing machine. © 1968 Springer-Verlag New York Inc.
John S. Lew, Arnold L. Rosenberg
Journal of Number Theory
Arnold L. Rosenberg, Lawrence Snyder
SIGMOD 1979
Arnold L. Rosenberg, Derick Wood, et al.
STOC 1979
Arnold L. Rosenberg
Journal of the ACM